Fatty acid effect on hydroxypropyl methylcellulose-beeswax edible film properties and postharvest quality of coated 'Ortanique' mandarins.
The objective of this work was to investigate the effect of fatty acid (FA) type and content on mechanical properties, water vapor permeability and oxygen permeability of hydroxypropyl methycellulose (HPMC)-beeswax (BW) stand-alone edible films. The effect of these films formed as coatings on the postharvest quality of 'Ortanique' mandarins was also studied. Selected FAs were stearic acid (SA), palmitic acid (PA), and oleic acid (OA), using BW/FA ratios of 1:0.5 and 1:0.2 (w/w). HPMCBW coatings reduced weight and firmness loss of 'Ortanique' mandarins, without compromising flavor quality compared to uncoated mandarins. Coatings containing OA provided the best weight loss control at both concentrations tested; however, when the BW/OA ratio was 1:0.5, the coatings increased fruit internal CO2, ethanol, and acetaldehyde contents of 'Ortanique' mandarins, therefore reducing flavor compared to the rest of the coatings studied. Although barrier and mechanical properties might be used to understand coating performance, differences observed between film oxygen permeability and coating permeability indicate that permeance should be measured on the coated fruit.
Navarro-Tarazaga
María Ll
ML
Postharvest Department, Instituto Valenciano de Investigaciones Agrarias-Fundación AGROALIMED, 46113 Moncada, Spain
Del Río
Miguel A
MA
Krochta
John M
JM
Pérez-Gago
Maria B
MB
D032084:Citrus sinensis; D005227:Fatty Acids / Q000032:analysis*; D018857:Food Packaging / Q000295:instrumentation*; D005519:Food Preservation / Q000379:methods; D005638:Fruit / Q000737:chemistry*; D006801:Humans; D065347:Hypromellose Derivatives; D008747:Methylcellulose / Q000031:analogs & derivatives*; D019301:Oleic Acid / Q000032:analysis / Q000737:chemistry; D019308:Palmitic Acid / Q000032:analysis / Q000737:chemistry; D011786:Quality Control; D012677:Sensation; D013229:Stearic Acids / Q000032:analysis / Q000737:chemistry; D014885:Waxes
D005227:Fatty Acids; D013229:Stearic Acids; D014885:Waxes; D019301:Oleic Acid; D019308:Palmitic Acid; C038228:beeswax; D065347:Hypromellose Derivatives; C031183:stearic acid; D008747:Methylcellulose